will william ever give poor grelle his death sythe back? (maybe in time for christmas,lol?)

He will get it back.....eventually. But, yes, in time for Christmas would be nice XD

I dont really know if William is in charge of that per-say, but he does have a high ranking seat among the shinigami so, maybe with a little persuasion then he might be able to get it back for him. After all the council *or whoever is in charge up there* should know by now that Grelle is just Grelle and is not much of a threat since William looks after him.

other wise IDK when he might get it back.

He gets it back in the end of the first season of the anime, but for the manga I don't know the chapter per-say. Though it's really funny when Grell uses his tiny scissors! He gets so happy when he gets his chainsaw back it's hilarious!! XD